Re: Towing 10,000 lbs. with Infinity QX56
A half ton is a lot to be over the max towing rating for anything. It may be one thing to tow it around the corner or across the yard but I'd say forget towing it on the freeway or anywhere you may have to stop or maintain a sustained highway speed.
Those things are based on the Nissan Titan, a buddy has a Titan and we used to to haul a friends 24' speed boat about 120 miles last fall. The boat was normally pulled by a 3/4 ton GMC diesel, but it was in the shop for service.
The Nissan did not tow that boat comfortably and the total boat and trailer weight was no more than 6500 lbs at best. (Probably far less than that).
The truck sat low in the rear, we couldn't put enough tension on the load equalizer bars to level it, it stopped the weight ok, not great but it did the job that way, it got no more than 7 mpg on the trip, and acceleration was slow to say the least. I really thought the truck was going to break, it felt like we were towing ten times that weight.
I had towed that same boat, on its older trailer with my 1 ton Dodge van before and it did just fine. The trailer has electric over hydraulic brakes on both axles. The worst part of the tow was how much the boat pulled the Nissan around when the bow caught the wind, any speed over about 45 mph felt unsafe.
So with that experience in mind, I'd have to say forget pulling 10K with the Infinity. Find someone with a 3/4 ton truck or upgrade to a heavier tow vehicle.